spiceqxl_io_port: mark FLUSH_SURFACES_ASYNC as unimplemented, do half of it
spiceqxl_io_port: mark FLUSH_SURFACES_ASYNC as unimplemented, do half of it

facboy/xserver-xorg-video-qxl,facboy/xserver-xorg-video-qxl,dezelin/xf86-video-qxl,fgouget/xf86-video-qxl,fgouget/xf86-video-qxl,fgouget/xf86-video-qxl,facboy/xserver-xorg-video-qxl,fgouget/xf86-video-qxl,dezelin/xf86-video-qxl,dezelin/xf86-video-qxl,facboy/xserver-xorg-video-qxl